Improvement in the mode of molding, preparatory to casting



`UNITED STATES STEPHEN PARSONS, OF EDGECOMB, MAINE.

IMPROVEMENT IN THE MODE OF MOLDING, PREPARATORY T0 CASTING, CURVED VENT0R REACTION WATER-WHEELS.

Specification forming part of Letters Patent No. LHT?, dated April 1S,1339.

To @ZZ whom, it may concern,.-

Be it known that I, STEPHEN PARSONS, of Edgeco1nb,in the county ofLincoln and State oi Maine, have invented a new and improved mode ofmolding and casting very powerful water-wheels on the centrifugalprinciple, the power of which is given by the action of the iiuidoperating upon a particular angle, curve, and size of the vents, alsofrom the form of the partitions between the vents and the size for theinlets of the water, and by the exact proportion of all the parts in theconstruction of said wheel, so ,that the propelling-power shall beapplied to the interior of the wheel; and I do hereby declare that thefollowing is a full and exact description of the same.

The nature ot my invention consists in a peculiar mode of molding andcasting iron water-wheels that can bc applied to any kind of water-works,and in any position, either vertical,horizontal, or oblique, and evenwhen wholly immersed by iioods.

To enable othersto make and use my said invention, I will proceed todescribe its construction and operation, reference being had to theannexed drawings of the same, making part of this specification, inwhich- Figure l is a plan ot' the trestle-plate; Fig. 2, a plan of thecore; Fig. 3, a perspective view of the oven; Fig. ek, a perspectiveview of the wheel cast, and Fig. 5 a side elevation of the core placedon the furnace.

I construct my centrifugal curved ventwheel of any size by providing acast-iron plate of the requisite diameter', usually about iive-eighthsof an inch in thickness, with a circular hole in its center otsufficient size to let the heat pass through while the core is baking.On said plate, Fig. l, T sweep the dotted circle Aior the diameter ofthe wheelsay fortyinches. l then make a second circle B-say twenty-sixinches diaineter-for the size oi the inlet of the water. I then make athird circle Csayfourtecu inches in diameter-to set one foot ot' thedividers in when sweeping the curve ot' the vents. I then divide saidcircle C into sixteen equal parts a. I then open the dividers thirteeninches fora wheel of the size designated, set one foot in a on circle C,and sweep the curve b from circle B to circle A, so as to make the chordot the curve?) nineteen and one-halt inches, and thus proceed untilsixteen curves arc completed.

Then drill two holes through said plate in each curve IJ of an equaldistance from each end of said curve at c to receive the dowels in thelower edges of the curve-plates D to hold them in their proper placeswhen molding. a furnace E about one foot high, and provide sixteen ironplatesD,eight inches high, curved so as to conform to the curve b, theirlower edges somewhat smaller, so as to draw easily from the mold, havingtwo holes cl in the inner edge of an equal distance from each end fordowels, agreeing with and conforming to the holes c in the curve linesb. (The reason why the holes in the curves b and in the plates D shouldbe at equal distances fromw each of the ends is in order to use eitherside of said trestle-plate, which will reverse the turning of thewheel.) Said curve-plates D above specified are nineteen and one-halfinches in the chord of the curve and about iive-eighths of an inch thickin the middle of the upper edge, and their ends are brought nearly to anedge, in order that the iiuid may have fr ee passage in its egress fromthe center to the periphery of the wheel. T then erect the curve-platesD on the trestle-plate with the dowels d in the holes c conforming tothe curves l). T then take conic hoops F and G as high as thecurve-platesD and of suiiicient strength to raise the core by, whichhoops must be perforated with holes to give vent to the gas that willarise while casting. rllhe conic hoop F should be three inches less indiameter than the inlet of the water or iiuid inside of the curve-platesD and set with its large end downward. The hoop G should be about threeinches larger in diameter at the smallest end and be set with its smallend downward outside ot' said plates D, as in Fig. l. I then fasten saidhoops F and G so as to form concentric circles, said plates D beingarranged between them, as shown in the draw ings, Fig. l.. proceed tolill the core, and while filling the same insert a sui'ticient number ofcurved nail-rods between each plate to strengthen the core when theplates are withdrawn, and when the core is finished (of which Figxrepresents a top view and 5 a side View) cover it with a cylindricaloven, Fig. 3, and bake it. Said core is lifted from the plate, Fig. 1,bythe conic hoops F and G and placed I then place the trestle-plate, Fig.l, on

T then fasten said plates D andN in a sand mold made in the usual )my byn. The Within-described manner of casting n block pattern prepared forthatpurpose. The 1 centrifugal curve vent;` Water- Wheel conlnold is nowready,and the process of casting struebed as herein set forth.

is performed as usual, which Will produce the centrifugal curvevent-Wheel represented by STEPHEN PARSONS.

Fig. 4. Witnesses:

That I Claim as my invention, and desire HAZARD KNOWLES,

to Secure by Letters Patent, is XVM. H. BREWSTER.

